Need some help as I’m venturing into new area. Picked up a Harlem untested. Got home and would not power up in anyway. Replaced the two prong plug with a three prong plug and tried again. When I powered it on it blew the Q4 transistor on the solenoid board along with R17 and R18 resistors. It also blew the trace out from Q4 to pin 5 at J1. I checked schematics and it indicates these parts are linked to the out kicker solenoid. I replaced Q4, R17 and R18 and jumped a wire to replace trace from Q4. I also removed a wire off one of the legs of the out kicker solenoid thinking if that was a problem I would eliminate it. Powered on and Q4 blew again.

At this point thought I should see if anyone had any suggestions to next step.

It blew as soon as I flipped the power switch

As for the plug the machine was not getting power before that. Sorry I probably could have left that out to be less confusing.

Thanks hopefully will be able to try this Today.

Is that J1 and J3 on solenoid board of transformer? When you say pull Playfield fuse are you referring to the fuse mounted to the underside of the Playfield?

Sorry should have been J1 and J3 on solenoid board or transformer. Got it.

Pulled J1 and J3 from rectifier.
Pulled Playfield fuse
Pulled J4 from SDB.
Powered on only coin door lights light, but nothing blowing.

Got the following at rectifier.
TP1: 7.8dc
TP2: 240dc
TP3: 16dc
TP4: 9.4ac
TP5: 58dc
All seem to be above the 10% margin I am reading about.

SDB:
TP1: 1.4dc
TP2: 1.3dc
TP3: 1.4dc
TP5: 1.3dc
Obvious a problem or should this be expected with all that’s disconnected?

I unplugged SDB J4 and not MPU J4. Damn!

Okay pulled MPU J4, plugged J1,J2 and J3 on RB.
Have all plugs in on SDB. Powered on have GI and some signs of displays.
Have no voltage at SDB TP’s. I actually don’t think I ever had any readings at SDB. Previously I grounded to braided wire which I noticed was giving me the 1.4’ish I was getting before.

I have continuity at both tests.

I just reflowed pins on SDB and now have the following at test points:

1: 6.2
2: 0
3: 0
4: 0
5: 18.8

Okay sorry guys and I appreciate you putting up with a rookie. Reflowed the rectifier now as well and here is what I have now. And I also didn’t have the meter on high (thanks valid).

Rectifier
1: 5.7
2: 240
3: 14.8
4: 6.8
5: 40

SDB
1: 5.1
2: 173
3: 3.8
4: 240
5: 14.8

That seems better.

No flashes. LED is solid lit. Voltages seem good.
TP1: 5.1
TP2: 14.4
TP3: 19.6
TP5: 5.1.

Gotcha. I will try that. I haven’t pulled the board yet to see what it even looks like. I will reset chips and reflow the pins and see what I get. I’m eager to see something so hopefully I can try tonight. If not I’m in Atlanta the remainder of the week. Thanks again for the help everyone. I’ll keep posted.

I’m back and sorry but life got in the way of this hobby! After the MPU was locked up I moving forward was beyond my level at this point in time. Fortunately I have a great guy in the area I could pull the board and take to. His diagnosis was there was a bunch of garbage chips installed most not even relative to Harlem Globetrotters. He figured someone probably just filled them up to sell. Either way he got those straightened out, replaced some pins and transistors and got me to 7 flashes, but that was on his Strikes and Spares since he didn’t have the whole game. Brought it home put in my game, made sure all voltages were safe, plugged everything in and got 7 flashes and game booted. Sound was garbled and displays are 50/50at best. Put Playfield fuse back in and started again. Bad news outkicker coil still locked on. Disconnected that coil and restarted and everything worked or better maybe should say responded. All coils worked, lights seem good. Sound bad and displays bad. I can’t see any obvious shorts. The related section to this coil on SDB all checks good.......and that is where I am at.

Okay. What am I checking it for?

i Believe ValidPower may be correct with U1 chip being the culprit. I think I have checked everything. I threw a Alltek into it and everything working. I am very fortunate as I have a pinball parts and new and used machine distributor 1 mile from my front door. Yep, a brick and mortar 1 mile from me. I have a SDB I can cannibalize a U1 from so hopefully next weekend I can try to swap that in and see if it is actually the problem. I will update. I really do appreciate all the help from everyone. Hopefully some day I can pay it back to the community.

Finally an update. I received the U1 chip today. Installed and the SDB works! As I mentioned previously the rotten dog put in got game working so knew it was a SDB issue. Just closing the loop for the thread. Now the issues remains are sound board, which I received a cap kit for today and quickly realized that the sound board was an -32 and not a -50 as is supposed to be in the game. Went thru displays and they were a mess. Missing components and such. Got one display working 100% another had only the 10’s out. The others I don’t have the components to go further but have them ordered. Again since this subject is the SDB I’ll move on. Thanks to everyone for your help, I’ve learned a bunch since the first post.